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A software 
application for 
the TI-73 
Explorer™ 



How To. 



□ Start and Quit the Application 

□ Use On-screen Options and Menus 

□ Draw Using Logo Light 

□ Draw Using Isometric Dots 

□ Delete the Application 

More Information 



□ Error Recovery 



11/18/03 



1 2003 Texas Instruments 



Important information 

Texas Instruments makes no warranty, either express or implied, 
including but not limited to any implied warranties of 
merchantability and fitness for a particular purpose, regarding any 
programs or book materials and makes such materials available 
solely on an "as-is" basis. 

In no event shall Texas Instruments be liable to anyone for 
special, collateral, incidental, or consequential damages in 
connection with or arising out of the purchase or use of these 
materials, and the sole and exclusive liability of Texas 
Instruments, regardless of the form of action, shall not exceed the 
purchase price of this item or material. Moreover, Texas 
Instruments shall not be liable for any claim of any kind 
whatsoever against the use of these materials by any other party. 

Graphing product applications (Apps) are licensed. See the terms 
of the license agreement for this product. 



Microsoft, Windows, Windows NT, Apple, and Macintosh are trademarks of their 
respective owners. 



Explorer Draw Page 2 



What is the Explorer Draw application? 

Using the Explorer Draw application, you can draw and 
investigate shapes in two and three dimensions by choosing one 
of the two drawing modes. 

• Logo Light is a programming language containing a set of 
commands that enable you to draw and study two-dimensional 
shapes. These shapes can be viewed with or without a 
coordinate system. Commands in the programming language 
include rotating the turtle and stepping forward or backward, 
as well as more complex ones like drawing circles and 
repeating a set of commands. 

• Isometric Dots lets you draw 3-D wire-frame shapes in a 2-D 
environment by adding segments to an isometric drawing 
area. 

The Explorer Draw application is a concept application that Tl 
wants to share with our customers, educators, and students 
before the product definition and testing are complete. It is an 
alpha software version, and as such, it may contain imperfections, 
or the coding may be incomplete. 

Tl invites your feedback concerning the functionality and 
educational value of the Explorer Draw application. Please send 
your comments and questions to concept@list.ti.com. 

Explorer Draw Page 3 



What You Need 



Hardware and software 



Notes 



TI-73 Explorer™ with version 1.60 or 
higher of the Graph Explorer software 



You can download a free copy of the 
latest Graph Explorer software from 
education.ti.com/softwareupdates . 
Follow the link to Operating Systems. 



Computer with Windows® 
95/98/2000/XP, Windows NT®, or 
Apple® Mac® OS 7.1 or higher installed 



Tl Connectivity computer-to-device 
cable 



Tl Connectivity cables are available 
for purchase from retail stores, online 
retailers, and instructional dealers. 
See a list at education.ti. com/buy . 
You may also purchase Tl 
Connectivity cables from the Tl 
online store at 
education.ti.com/shop . 



Tl Connect™ software, which works with 
most supported models of Flash-based 
Tl graphing devices 



You can download free copies of 
Tl Connect software from 
education.ti.com/downloadticonnect. 



Explorer Draw 



Page 4 



Where to Find Installation Instructions 

Detailed instructions on installing this and other applications are 
available at education.ti.com/quides . Follow the link to Flash 
installation instructions. 



Getting Help 

Explorer Draw has built-in help screens that give you basic 
information about using both Logo Light and Isometric Dots. To 
display help screens, select HELP (press Itracei ). 

The instructions in this guidebook are only for this application. If 
you need help using the TI-73 Explorer, refer to its 
comprehensive guidebook at education.ti.com/guides . 



Explorer Draw Page 5 



Starting and Quitting the Application 

Starting the Application 

1 . Press IAPPSI to display the list of applications on your 
TI-73 Explorer™. 

2. Select EXPDRAW. The application's information screen is 
displayed. 

3. Press any key to continue. The programmer's screen is 
displayed. 

4. Press any key to continue. The main menu is displayed. 



Quitting the Application 

From the application's main menu, select EXIT (press \v=\) or press 
[2nd] [QUIT]. 



Explorer Draw Page 6 



Navigating 

Selecting Menu Items 

To select an item from a menu, press or to highlight the 
menu item, and then press I enter I to select it. 

Using On-Screen Options 

To select an option at the bottom of the screen, press the 
graphing key directly below the option. 



IRlflELFlfMDSl 

— 7^ty 

[Y3 IWINDOWl [ZOOM] ITRACE] IGRAPHI 



Explorer Draw 



Page 7 



Drawing with Logo Light 

Programming shapes with the basic set of commands in Logo 
Light helps you understand the basics of distances, angles, and 
characteristics of polygons while using logical thinking. In Logo 
Light, a turtle is programmed to draw various shapes and figures 
in a two-dimensional environment, using a programming language 
with a basic set of commands. 

1 . From the Explorer Draw main menu, select LOGO LIGHT. 

2. Select an existing Logo file to open, or select NEW LOGO 

FILE. 



SELECT H FILE TO PLflV! 



hU!H.M.mH 



DPEIi LDGDi 
DFEn LDGD2 
DPEIi LDGD3 



select £ presscenter] 
(HeLTi 



The drawing screen has two parts: 

• The main part of the screen is the drawing area. You start to 
draw from the center of the screen, where you see the tip of 
the drawing pen. The shape of the tip of the drawing pen 
(called the turtle, as in other versions of Logo) can be a 
triangle, a diamond or an X. 



Explorer Draw 



Page 8 



• Along the bottom of the screen are the command line and 
three menu buttons. You input commands into the command 
line to draw your drawing one step at a time. 



Command line 




Displays a list of 
commands you can use. 



Inputting drawing commands 

1 . Select CMDS to display a list of commands. 

2. To select a command, press or to highlight the 
command, and then press Ienteri to paste it into the command 
line. 

3. Enter the parameter(s) (inputs) for the command, and then 
press lENTERl . (Some commands do not require parameters.) If 
you have entered the command using the correct syntax, the 
command is executed. Otherwise, you need to revise the 
command. 



Explorer Draw 



Page 9 



Note 



Press H and to move the cursor within the command line. 

Press ICLEARI to delete everything on the command line. 

Press [del] to delete the highlighted character. 

Press [2nd] [ins] to insert a command between two other 
commands. 

Press ICLEARI to close the commands menu (or any other 
menu). 



The following commands are available: 



Command 



Description 



FD number 



Move forward the number of steps specified in the 
current direction. The number of steps the turtle 
can move in one command is from to 100. Each 
pixel is one unit on the screen. 



BK number 



Move backward the number of steps specified. 
The number of steps the turtle can move in one 
command is from to 1 00. Each pixel is one unit 
on the screen. 



LT angle 



Rotate left to a new drawing direction by the angle 
specified. The angle must be from 0° to 360°. 



RT angle 



Rotate right to a new drawing direction by the 
angle specified. The angle must be from to 360. 



Explorer Draw 



Page 1 



Command 



Description 



CIRCLER radius 



Starting from the current position (on the 
circumference), draw a circle to the right. The 
maximum radius is 100. 



CIRCLEL radius 



Starting from the current position (on the 
circumference), draw a circle to the left. The 
maximum radius is 100. 



ARCR radius, angle 



Starting from the current position, draw an arc to 
the right. The maximum radius is 50; the angle 
must be from 0° to 360°. 



ARCL radius, angle 



Starting from the current position, draw an arc to 
the left. The maximum radius is 50; the angle 
must be from 0° to 360°. 



PD 



Sets the pen down to draw. This is the standard 
mode. Every move that is made will leave a trace 
on the screen. 



PE 



PU 



Makes the pen an eraser. Any commands to draw 
will erase the drawing after PE is executed. The 
pen stays in this state until the PD command is 
executed again. 

Lifts the pen so that you can move it without 
drawing. The pen stays in this state until the PD 
command is executed again. 



Explorer Draw 



Page 1 1 



Command Description 



HT Hides the shape of the turtle. Drawing is still 

possible, but the turtle shape is not shown. 

ST Shows the shape of the turtle again. 

CC Deletes the command history entered so far. 

If you use the CC command before or when you 
reach 60 commands, you can keep adding to your 
current drawing. Only the last set of commands is 
saved when you save your drawing as a file. If you 
save your drawing as a PIC, the complete image 
in the drawing area is saved. 

CS Clears the entire screen and places the turtle in 

the center. 

CT Clears the text on the screen. 

HOME Turtle moves to the center of the screen. 

GRID Toggles the drawing grid on and off. 

AXES Toggles the coordinate axes on and off. Each 

pixel is one unit on the screen. 



Explorer Draw Page 12 



Command 



Description 



PR text 



REPEAT n (commands) 



Prints text on the screen. Text can be at most 4 
characters long. Use subsequent PR commands 
for longer texts. Enter text using the TI-73 
Explorer text editor ([2nd] [text]). 

Repeats a list of commands n times. A maximum 
of four commands can be entered in the 
parentheses. You can use the Repeat command a 
maximum of 1000 times in one drawing. 



The Repeat command uses two command "slots." 
It helps to think of it as using one command for 
REPEAT and one for the number of times the 
subsequent commands in parentheses will be 
repeated. For example, REPEAT 4 (FD 10 RT 90) 
uses four commands. 



SETPOS number, number 



SHAPE # 



STAMP 



Moves the turtle to position specified. The 
numbers must be from -50 to 50. If turtle is 
rotated before you use this command, it remains 
rotated after it moves to the new position. 

Changes the shape of the turtle to one of the 
following: 1 = triangle, 2 = diamond, 3 = X. 

Stamps the turtle's shape on the drawing area. 



Explorer Draw 



Page 13 



Correcting Errors 

If a command you entered is invalid, an error message is 
displayed. Press any key to exit the error message and return to 
the command line. 



Error message 



Description 



PRESS <CMDS> TO SELECT A 
COMMAND. 

PRESS <HELP> TO LEARN 
MORE ABOUT COMMANDS. 



No command was entered or the Repeat 
command was used incorrectly, for 
example, "12" or "REPEAT 4(23)". 



LOGO LIGHT DOES NOT 
UNDERSTAND. 

TRY <HELP> OR [CLEAR]. 

THE input FOR command MUST 
BE number<=input<=number 



The command(s) entered cannot be 
interpreted. Check HELP for help on 
using commands, or press |Clear| to clear 
the command line. 

The input entered is not within the correct 
limits for the command. See the list of 
commands for limits. 



TURTLE HAS REACHED THE 
MAXIMUM NUMBER OF 60 
COMMANDS 



The history holds a maximum of 60 
commands. If this limit is reached, no 
more commands can be added. Enter 
the view side for further action like 
saving the files or the picture. 



Explorer Draw 



Page 1 4 



Error message 



Description 



ONLY number MORE 
COMMANDS ARE ALLOWED. 
THIS ENTRY HAS TOO MANY 
COMMANDS 

ONLY 4 COMMANDS CAN BE 
REPEATED 

TURTLE IS OFF THE SCREEN! 
YOU CAN USE HOME TO SEE 
TURTLE AGAIN. 



The command history is almost full. The 
command you have entered (a Repeat 
command, for example), would exceed 
the 60-command maximum. 

The Repeat command can repeat a 
maximum of four commands. 

The commands you have entered have 
moved the turtle off the screen. To return 
to the center of the screen, use the 
Home command. 



Viewing the Command History 

After a command is executed, it is placed in the command history. 
The history stores up to 60 commands. You can view a numbered 
list of commands on the command viewer screen or you can 
scroll through the command history from the command line on the 
drawing screen. 

• To display the command viewer screen, select the -> option. 
Select <- to return to the drawing area. 



Explorer Draw 



Page 1 5 



• To scroll through the command history on the drawing screen, 
use the up and down arrow keys. To copy a command from 
the command history to the command line, press or to 
highlight the command, and then press [enter] . You can edit 
the command, if necessary, before pressing Ienteri to execute 
it. 

Saving a File or a PIC 

To save a file: 

1 . Press [2nd] [quit] or select FILE and then SAVE FILE from the 
command viewer screen . 

2. Press ienteri to select YES. 

Tip To cancel, press and then press Ienteri to select NO. 

3. Press or to highlight a file name, and then press Ienteri 
to save the file to the file name. 

When you save a PIC, you save the drawing that you created, but 
the commands to create that drawing are not saved. Only the 
drawing area of the screen is saved. The PIC is automatically 
cropped from the bottom so that the on-screen options are not 
part of the image. 

Explorer Draw Page 1 6 



To save a pic: 

1 . Select FILE and then SAVE PIC from the command viewer 
screen. 

2. Press Ienteri to select YES. 

Tip To cancel, press and then press Ienteri to select NO. 

3. Press or to highlight a file name, and then press Ienteri 
to save the file to the file name. 

Tip You can use Explorer Draw PICs in a StudyCards™ stack 

without having to edit or crop them. 



Example - Drawing a Square 

1 . From the Logo Light drawing screen, select CMDS to display 
the menu of commands. 

2. Select FD, and then type 10. 

3. Press I enter I to execute the command. Turtle moves forward 
10 units. 



Explorer Draw Page 1 7 



~|5tfJELPlfcHDg| 



4. Enter and execute the following commands to draw a square: 
RT90 
FD10 
RT90 
FD 10 
RT90 
FD10 
RT90 



D 



~|5tfJELPlfcHDg| 



Tip 



You can press to see your previous commands. To copy a 
command, press to highlight it, and then press I ENTER I to 
copy it to the current command line. 

You can use the Repeat command to draw a square, by 
entering REPEAT 4 (FD 10 RT 90). 



Explorer Draw 



Page 18 



Remember, you can see a list of your commands on the 
Command Viewer screen and you can save your file or save your 
drawing as a PIC. 

Example 2 - Polygons to Circle 

1 . Draw a regular hexagon using the following Repeat 
command: REPEAT 6 (FD 1 5 RT 60). 




2. Clear the screen (use the CS command). 

3. Now, draw a regular octagon: REPEAT 8 (FD 1 5 RT 45). 




4. Clear the screen. 



Explorer Draw 



Page 1 9 



5. 



Next, draw a decagon: REPEAT 10 (FD 10 RT 36). What 
shape are you starting to see? 




6. Try each of the following Repeat commands. (Remember to 
use the CS command to clear the screen before you enter 
subsequent Repeat commands.) Write a description of the 
shapes you see. As the number of sides of the polygon 
increases, does the polygon look like another familiar shape? 
REPEAT 30 (FD2RT12) 
REPEAT36(FD2RT10) 

REPEAT 45 (FD 2 RT 8) 
REPEAT 60 (FD 2 RT 6) 
REPEAT 90 (FD 2 RT 4) 
REPEAT 120 (FD2RT3) 

7. Clear the screen, and then use the CIRCLER or CIRCLEL 
commands. What do you notice? Try different radius values, 
too. 

CIRCLER 15 
CIRCLEL 15 



Explorer Draw 



Page 20 



Drawing with Isometric Dots 

In Isometric Dots, you can draw three-dimensional images on an 
isometric two-dimensional grid. This helps you to understand 
principles of three dimensions and hidden surfaces. 

1 . From the Explorer Draw main menu, select ISOMETRIC DOTS. 

2. From the isometric dots main menu, select ISOMETRIC 

DOTS. 

3. Select an existing file to open, or select NEW ISO FILE. 



(CrSBI 



IHELF'I'FILE'I 



4. Select DRAW to enter the drawing mode. 

5. Use the arrow keys to move the cursor to the location on the 
grid where you want to begin drawing. 

Note • p r ess and to move the cursor vertically on the grid. 

| • Press H and to move the cursor diagonally on the grid. 



Explorer Draw 



Page 21 



6. Select ADD, and then move the cursor to the endpoint of the 
first segment. 




7. Select ADD again to complete the segment. 



+ __+ + + + + 

r + + + + + 
+ + + + + + 
+ + + + + + 

i!H!ifTEL|5urfKiiELF| 



8. Repeat steps 5-7 until your drawing is complete. 

Note Select DEL to delete line segments. Segments are deleted in the 

reverse order that they were added. 

Saving a File or a PIC 

To save a file: 

1 . Select QUIT to exit the drawing mode, if necessary. 



Explorer Draw 



Page 22 



2. Select FILE and then SAVE FILE. 

3. Press ienteri to select YES. 

4. Press or to highlight a file name, and then press Ienteri 
to save the file to the file name. 

To save a PIC: 

1 . Select QUIT to exit the drawing mode, if necessary. 

2. Select FILE and then SAVE PIC. 

3. Press ienteri to select YES. 

4. Press or to highlight a file name, and then press Ienteri 
to save the file to the file name. 

Tip You can use Explorer Draw PICs in a StudyCards™ stack 

without having to edit or crop them. 

Practicing with Sample Cube Stacks 

The sample cube stacks test your ability to recognize three- 
dimensional images. 



Explorer Draw Page 23 



1 . From the isometric dots main menu, select SAMPLE CUBE 
STACKS. The introductory screen is displayed. 

2. Select NEXT to start the sample. 

3. Guess how many cubes it takes to build the image shown. 
You can try to build the image with multilinks, cubes, or sugar 
cubes. 

4. Select CUBES? to see if your answer is correct. 

5. Press any key to exit the answer screen, and then select 
NEXT to display the next image. 

6. Select QUIT SAMPLES to return to the isometric dots main 
menu. 

Example 3 - Isometric Dots 

1 . From the Isometric Dots drawing screen, select DRAW to 
begin drawing. 

2. Select ADD to add the first point of the segment. 



Explorer Draw Page 24 



3. Use the arrow keys to select another point, and then select 
ADD to finish the segment. Add all of the segments (edges) to 
finish drawing the cube shown. 



+ + + + + + 

: : : : : $ : : : : 



rflDDYPEntlUlMELFl 



4. Select QUIT to return to the main drawing screen. 

Now, you can save your file to open later or save your drawing as 
a PIC. 



Explorer Draw 



Page 25 



Deleting the Application 

1 . Press [2nd] [mem] to display the memory menu. 

2. Select Delete. 

3. Select Apps. 

4. Move the cursor to EXPDRAW. 

5. Press I enter | . A confirmation message is displayed. 

6. Select Yes to delete the application. 



Explorer Draw Page 26 



Installation Error Messages 

Low Battery 

Do not attempt to download a Flash application if the low-battery 
message appears on the home screen. Low battery indication is 
shown on the initial screen. If you receive this error during an 
installation, change the batteries before trying again. 

Invalid Signature or Certificate 

Either this calculator does not have a certificate to run the 
application, or electrical interference caused a link to fail. Try to 
install the application again. 

Error in Xmit 

This problem is usually associated with the unit-to-unit cable and 
its connection between the calculators. Make sure the cable is 
firmly inserted in the link port of each calculator. 



Explorer Draw Page 27 



Communication Error 

This error indicates that the Tl Connect™ software ("Unable to 

communicate with device") is unable to communicate with the 

calculator. The problem is usually associated with the 

Tl Connectivity cable and its connection to the calculator or to the 

computer. 

• Make sure the cable is firmly inserted in the calculator link port 
and the computer. 

• Verify that the correct cable type is selected in the software 
link settings. 

• Verify that the correct communications port (Com Port) is 
selected in the software link settings. 

If this does not correct the problem, try a different Tl Connectivity 
cable and restart your computer. 



Explorer Draw Page 28 



Memory Error 

This error occurs when the TI-73 Explorer™ does not have 
sufficient memory for the application. In order to make room for 
another application, you must delete an application from the 
device. Before you delete an application from the TI-73 Explorer, 
you can save it on your computer using Tl Connect™ software. 
You can reload it to the device later using Tl Connect software. 

Other Errors 

See Appendix B in the TI-73 Explorer manual for information 
about the specific error. 



Explorer Draw Page 29 



CONCEPT APPLICATION EVALUATION 
LICENSE AGREEMENT 

(Including Preview, Prototype, and Demo Apps) 

BY DOWNLOADING THE SOFTWARE AND/OR DOCUMENTATION YOU AGREE TO ABIDE BY 
THE FOLLOWING PROVISIONS. 

1 . LICENSE: Texas Instruments Incorporated ("Tl") grants you a license to use and copy the software 
program(s) ("Licensed Materials") contained on this diskette/CD/web site. You, and any 
subsequent user, may only use the Licensed Materials on Texas Instruments calculator products. 

2. RESTRICTIONS: You may not reverse-assemble or reverse-compile the Licensed Materials. You 
may not sell, rent, or lease copies that you make. 

3. COPYRIGHT: The Licensed Materials are copyrighted by Tl or the third party licensor. Licensee 
agrees that he/she will not delete the copyright notice, trademarks or protective notices from the 
Licensed Materials or copies made during installation. 

3. SUPPORT: The Licensed Materials are provided by Tl with the understanding that only limited 
support for this concept application may be available from Tl. 

4. TESTING: Licensee acknowledges that he/she understands that Tl has not in all cases subjected 
concept applications to rigorous testing and that the concept application may cause problems with 
his/her calculator, including its use in any kind of shared environment. Further, it is possible for a 
concept application to cause calculator crashes or lock ups which may be difficult to recover from. 
You are advised that use of the concept application is AT YOUR OWN RISK. 

5. WARRANTY: Tl does not warrant that the Licensed Materials will be free from errors or will meet 
your specific requirements. 

THE LICENSED MATERIALS ARE MADE AVAILABLE "AS IS" TO LICENSEE. 

6. LIMITATIONS: Tl MAKES NO WARRANTY OR CONDITION, EITHER EXPRESS OR IMPLIED, 
INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF MERCHANTABILITY 
AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING THE LICENSED MATERIALS. 

IN NO EVENT SHALL Tl, ANY THIRD PARTY LICENSOR, OR TI'S SUPPLIERS BE LIABLE 
FOR ANY INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS, 
LOSS OF USE OR DATA, OR INTERRUPTION OF BUSINESS, WHETHER THE ALLEGED 
DAMAGES ARE LABELED IN TORT, CONTRACT OR INDEMNITY. 



Explorer Draw Page 30 



SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR 
CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION MAY NOT APPLY. 

RESTRICTED RIGHTS: The Licensed Materials are provided with Restricted Rights. Use, 
duplication or disclosure by the United States Government is subject to restrictions as set forth in 
subparagraph [c](1)(ii) of the Rights in Technical Data and Computer Software clause at DFARS 
252.227-7013 or in subparagraph [c](1) and (2) of the Commercial Computer Software - Restricted 
Rights at 48 CFR 52.227-19, as applicable. 



Explorer Draw Page 31 



Page Reference 

This PDF document contains electronic bookmarks designed for easy on- 
screen navigation. If you decide to print this document, please use the page 
numbers below to find specific topics. 



Important information 2 

What is the Explorer Draw application? 3 

What You Need 4 

Where to Find Installation Instructions 5 

Getting Help 5 

Starting and Quitting the Application 6 

Starting the Application 6 

Quitting the Application 6 

Navigating 7 

Selecting Menu Items 7 

Using On-Screen Options 7 

Drawing with Logo Light 8 

Inputting drawing commands 9 

Correcting Errors 14 

Viewing the Command History 15 

Saving a File or a PIC 16 

Explorer Draw Page 32 



Example- Drawing a Square 17 

Example 2 - Polygons to Circle 19 

Drawing with Isometric Dots 21 

Saving a File or a PIC 22 

Practicing with Sample Cube Stacks 23 

Example 3 - Isometric Dots 24 

Deleting the Application 26 

Installation Error Messages 27 

CONCEPT APPLICATION EVALUATION LICENSE AGREEMENT 30 



Explorer Draw Page 33